Deneche,
Have you contacted the Watchmaker developers? Perhaps you should
share what you have done over there. I do notice that their website
says they have distributed support. How does that compare to ours?
-Grant
Begin forwarded message:
From: [EMAIL PROTECTED]
Date: August 17, 2008 11:02:01 AM EDT
To: [EMAIL PROTECTED]
Subject: [CONF] Apache Lucene Mahout: Watchmaker.GA.Tutorial (page
created)
Reply-To: [EMAIL PROTECTED]
Watchmaker.GA.Tutorial (MAHOUT) created by abdelhakim deneche
http://cwiki.apache.org/confluence/display/MAHOUT/Watchmaker.GA.Tutorial
Content:
---------------------------------------------------------------------
h1. How to distribute the fitness evaluation using Mahout.GA ?
In any Watchmaker program, you'll have to create an instance of a
StandaloneEvolutionEngine. For the TSP example this is done in the
EvolutionaryTravellingSalesman class:
{code:java}
private EvolutionEngine<List<String>>
getEngine(CandidateFactory<List<String>> candidateFactory,
EvolutionaryOperator<List<?>> pipeline, Random rng) {
return new
StandaloneEvolutionEngine<List<String>>(candidateFactory, pipeline,
new RouteEvaluator(distances), selectionStrategy, rng);
}
{code}
The RouteEvaluator class is where the fitness of each individual is
evaluated, if we want to distribute the evaluation over a Hadoop
Cluster, all we have to is wrap the evaluator in a
MahoutFitnessEvaluator, and instead of a StandaloneEvolutionEngine
we'll use a STEvolutionEngine :
{code:java}
private EvolutionEngine<List<String>>
getEngine(CandidateFactory<List<String>> candidateFactory,
EvolutionaryOperator<List<?>> pipeline, Random rng) {
MahoutFitnessEvaluator<List<String>> evaluator = new
MahoutFitnessEvaluator<List<String>>(new RouteEvaluator(distances));
return new STEvolutionEngine<List<String>>(candidateFactory,
pipeline, evaluator, selectionStrategy, rng);
}
{code}
And voila! your code is ready to run on Hadoop. The complete running
example is available with the examples in the org/apache/mahout/ga/
watchmaker/travellingsalesman directory
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--------------------------
Grant Ingersoll
http://www.lucidimagination.com
Lucene Helpful Hints:
http://wiki.apache.org/lucene-java/BasicsOfPerformance
http://wiki.apache.org/lucene-java/LuceneFAQ
